The LEA Psy-Cog study rests on a sample of the LEA cohort. Are included the patients 12-17-years-old from the PACA-Corse sub-cohort (administrative district of 4 million of people which corresponds to the Marseille and Nice centers). Patients from this two centers are the patients with the more important length of survey, allowing us to produce a not biaised estimation of prevalence rate. Finally, the choice of this subsample is supported by the proximity of the Mediterranean Center for Adolescent in Marseilles, specifically dedicated to the psychological follow-up of children suffering from cancer.